misc/builddeps/win32/sdl/include/SDL2/SDL_pixels.h

   1 /*
   2   Simple DirectMedia Layer
   3   Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
   4
   5   This software is provided 'as-is', without any express or implied
   6   warranty.  In no event will the authors be held liable for any damages
   7   arising from the use of this software.
   8
   9   Permission is granted to anyone to use this software for any purpose,
  10   including commercial applications, and to alter it and redistribute it
  11   freely, subject to the following restrictions:
  12
  13   1. The origin of this software must not be misrepresented; you must not
  14      claim that you wrote the original software. If you use this software
  15      in a product, an acknowledgment in the product documentation would be
  16      appreciated but is not required.
  17   2. Altered source versions must be plainly marked as such, and must not be
  18      misrepresented as being the original software.
  19   3. This notice may not be removed or altered from any source distribution.
  20 */
  21
  22 /**
  23  *  \file SDL_pixels.h
  24  *
  25  *  Header for the enumerated pixel format definitions.
  26  */
  27
  28 #ifndef _SDL_pixels_h
  29 #define _SDL_pixels_h
  30
  31 #include "SDL_stdinc.h"
  32 #include "SDL_endian.h"
  33
  34 #include "begin_code.h"
  35 /* Set up for C function definitions, even when using C++ */
  36 #ifdef __cplusplus
  37 extern "C" {
  38 #endif
  39
  40 /**
  41  *  \name Transparency definitions
  42  *
  43  *  These define alpha as the opacity of a surface.
  44  */
  45 /* @{ */
  46 #define SDL_ALPHA_OPAQUE 255
  47 #define SDL_ALPHA_TRANSPARENT 0
  48 /* @} */
  49
  50 /** Pixel type. */
  51 enum
  52 {
  53     SDL_PIXELTYPE_UNKNOWN,
  54     SDL_PIXELTYPE_INDEX1,
  55     SDL_PIXELTYPE_INDEX4,
  56     SDL_PIXELTYPE_INDEX8,
  57     SDL_PIXELTYPE_PACKED8,
  58     SDL_PIXELTYPE_PACKED16,
  59     SDL_PIXELTYPE_PACKED32,
  60     SDL_PIXELTYPE_ARRAYU8,
  61     SDL_PIXELTYPE_ARRAYU16,
  62     SDL_PIXELTYPE_ARRAYU32,
  63     SDL_PIXELTYPE_ARRAYF16,
  64     SDL_PIXELTYPE_ARRAYF32
  65 };
  66
  67 /** Bitmap pixel order, high bit -> low bit. */
  68 enum
  69 {
  70     SDL_BITMAPORDER_NONE,
  71     SDL_BITMAPORDER_4321,
  72     SDL_BITMAPORDER_1234
  73 };
  74
  75 /** Packed component order, high bit -> low bit. */
  76 enum
  77 {
  78     SDL_PACKEDORDER_NONE,
  79     SDL_PACKEDORDER_XRGB,
  80     SDL_PACKEDORDER_RGBX,
  81     SDL_PACKEDORDER_ARGB,
  82     SDL_PACKEDORDER_RGBA,
  83     SDL_PACKEDORDER_XBGR,
  84     SDL_PACKEDORDER_BGRX,
  85     SDL_PACKEDORDER_ABGR,
  86     SDL_PACKEDORDER_BGRA
  87 };
  88
  89 /** Array component order, low byte -> high byte. */
  90 /* !!! FIXME: in 2.1, make these not overlap differently with
  91    !!! FIXME:  SDL_PACKEDORDER_*, so we can simplify SDL_ISPIXELFORMAT_ALPHA */
  92 enum
  93 {
  94     SDL_ARRAYORDER_NONE,
  95     SDL_ARRAYORDER_RGB,
  96     SDL_ARRAYORDER_RGBA,
  97     SDL_ARRAYORDER_ARGB,
  98     SDL_ARRAYORDER_BGR,
  99     SDL_ARRAYORDER_BGRA,
 100     SDL_ARRAYORDER_ABGR
 101 };
 102
 103 /** Packed component layout. */
 104 enum
 105 {
 106     SDL_PACKEDLAYOUT_NONE,
 107     SDL_PACKEDLAYOUT_332,
 108     SDL_PACKEDLAYOUT_4444,
 109     SDL_PACKEDLAYOUT_1555,
 110     SDL_PACKEDLAYOUT_5551,
 111     SDL_PACKEDLAYOUT_565,
 112     SDL_PACKEDLAYOUT_8888,
 113     SDL_PACKEDLAYOUT_2101010,
 114     SDL_PACKEDLAYOUT_1010102
 115 };
 116
 117 #define SDL_DEFINE_PIXELFOURCC(A, B, C, D) SDL_FOURCC(A, B, C, D)
 118
 119 #define SDL_DEFINE_PIXELFORMAT(type, order, layout, bits, bytes) \
 120     ((1 << 28) | ((type) << 24) | ((order) << 20) | ((layout) << 16) | \
 121      ((bits) << 8) | ((bytes) << 0))
 122
 123 #define SDL_PIXELFLAG(X)    (((X) >> 28) & 0x0F)
 124 #define SDL_PIXELTYPE(X)    (((X) >> 24) & 0x0F)
 125 #define SDL_PIXELORDER(X)   (((X) >> 20) & 0x0F)
 126 #define SDL_PIXELLAYOUT(X)  (((X) >> 16) & 0x0F)
 127 #define SDL_BITSPERPIXEL(X) (((X) >> 8) & 0xFF)
 128 #define SDL_BYTESPERPIXEL(X) \
 129     (SDL_ISPIXELFORMAT_FOURCC(X) ? \
 130         ((((X) == SDL_PIXELFORMAT_YUY2) || \
 131           ((X) == SDL_PIXELFORMAT_UYVY) || \
 132           ((X) == SDL_PIXELFORMAT_YVYU)) ? 2 : 1) : (((X) >> 0) & 0xFF))
 133
 134 #define SDL_ISPIXELFORMAT_INDEXED(format)   \
 135     (!SDL_ISPIXELFORMAT_FOURCC(format) && \
 136      ((SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX1) || \
 137       (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX4) || \
 138       (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_INDEX8)))
 139
 140 #define SDL_ISPIXELFORMAT_PACKED(format) \
 141     (!SDL_ISPIXELFORMAT_FOURCC(format) && \
 142      ((SDL_PIXELTYPE(format) == SDL_PIXELTYPE_PACKED8) || \
 143       (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_PACKED16) || \
 144       (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_PACKED32)))
 145
 146 #define SDL_ISPIXELFORMAT_ARRAY(format) \
 147     (!SDL_ISPIXELFORMAT_FOURCC(format) && \
 148      ((SDL_PIXELTYPE(format) == SDL_PIXELTYPE_ARRAYU8) || \
 149       (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_ARRAYU16) || \
 150       (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_ARRAYU32) || \
 151       (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_ARRAYF16) || \
 152       (SDL_PIXELTYPE(format) == SDL_PIXELTYPE_ARRAYF32)))
 153
 154 #define SDL_ISPIXELFORMAT_ALPHA(format)   \
 155     ((SDL_ISPIXELFORMAT_PACKED(format) && \
 156      ((SDL_PIXELORDER(format) == SDL_PACKEDORDER_ARGB) || \
 157       (SDL_PIXELORDER(format) == SDL_PACKEDORDER_RGBA) || \
 158       (SDL_PIXELORDER(format) == SDL_PACKEDORDER_ABGR) || \
 159       (SDL_PIXELORDER(format) == SDL_PACKEDORDER_BGRA))) || \
 160     (SDL_ISPIXELFORMAT_ARRAY(format) && \
 161      ((SDL_PIXELORDER(format) == SDL_ARRAYORDER_ARGB) || \
 162       (SDL_PIXELORDER(format) == SDL_ARRAYORDER_RGBA) || \
 163       (SDL_PIXELORDER(format) == SDL_ARRAYORDER_ABGR) || \
 164       (SDL_PIXELORDER(format) == SDL_ARRAYORDER_BGRA))))
 165
 166 /* The flag is set to 1 because 0x1? is not in the printable ASCII range */
 167 #define SDL_ISPIXELFORMAT_FOURCC(format)    \
 168     ((format) && (SDL_PIXELFLAG(format) != 1))
 169
 170 /* Note: If you modify this list, update SDL_GetPixelFormatName() */
 171 enum
 172 {
 173     SDL_PIXELFORMAT_UNKNOWN,
 174     SDL_PIXELFORMAT_INDEX1LSB =
 175         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX1, SDL_BITMAPORDER_4321, 0,
 176                                1, 0),
 177     SDL_PIXELFORMAT_INDEX1MSB =
 178         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX1, SDL_BITMAPORDER_1234, 0,
 179                                1, 0),
 180     SDL_PIXELFORMAT_INDEX4LSB =
 181         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX4, SDL_BITMAPORDER_4321, 0,
 182                                4, 0),
 183     SDL_PIXELFORMAT_INDEX4MSB =
 184         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX4, SDL_BITMAPORDER_1234, 0,
 185                                4, 0),
 186     SDL_PIXELFORMAT_INDEX8 =
 187         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_INDEX8, 0, 0, 8, 1),
 188     SDL_PIXELFORMAT_RGB332 =
 189         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED8, SDL_PACKEDORDER_XRGB,
 190                                SDL_PACKEDLAYOUT_332, 8, 1),
 191     SDL_PIXELFORMAT_RGB444 =
 192         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB,
 193                                SDL_PACKEDLAYOUT_4444, 12, 2),
 194     SDL_PIXELFORMAT_RGB555 =
 195         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB,
 196                                SDL_PACKEDLAYOUT_1555, 15, 2),
 197     SDL_PIXELFORMAT_BGR555 =
 198         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XBGR,
 199                                SDL_PACKEDLAYOUT_1555, 15, 2),
 200     SDL_PIXELFORMAT_ARGB4444 =
 201         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ARGB,
 202                                SDL_PACKEDLAYOUT_4444, 16, 2),
 203     SDL_PIXELFORMAT_RGBA4444 =
 204         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_RGBA,
 205                                SDL_PACKEDLAYOUT_4444, 16, 2),
 206     SDL_PIXELFORMAT_ABGR4444 =
 207         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ABGR,
 208                                SDL_PACKEDLAYOUT_4444, 16, 2),
 209     SDL_PIXELFORMAT_BGRA4444 =
 210         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_BGRA,
 211                                SDL_PACKEDLAYOUT_4444, 16, 2),
 212     SDL_PIXELFORMAT_ARGB1555 =
 213         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ARGB,
 214                                SDL_PACKEDLAYOUT_1555, 16, 2),
 215     SDL_PIXELFORMAT_RGBA5551 =
 216         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_RGBA,
 217                                SDL_PACKEDLAYOUT_5551, 16, 2),
 218     SDL_PIXELFORMAT_ABGR1555 =
 219         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_ABGR,
 220                                SDL_PACKEDLAYOUT_1555, 16, 2),
 221     SDL_PIXELFORMAT_BGRA5551 =
 222         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_BGRA,
 223                                SDL_PACKEDLAYOUT_5551, 16, 2),
 224     SDL_PIXELFORMAT_RGB565 =
 225         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XRGB,
 226                                SDL_PACKEDLAYOUT_565, 16, 2),
 227     SDL_PIXELFORMAT_BGR565 =
 228         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED16, SDL_PACKEDORDER_XBGR,
 229                                SDL_PACKEDLAYOUT_565, 16, 2),
 230     SDL_PIXELFORMAT_RGB24 =
 231         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_ARRAYU8, SDL_ARRAYORDER_RGB, 0,
 232                                24, 3),
 233     SDL_PIXELFORMAT_BGR24 =
 234         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_ARRAYU8, SDL_ARRAYORDER_BGR, 0,
 235                                24, 3),
 236     SDL_PIXELFORMAT_RGB888 =
 237         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_XRGB,
 238                                SDL_PACKEDLAYOUT_8888, 24, 4),
 239     SDL_PIXELFORMAT_RGBX8888 =
 240         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_RGBX,
 241                                SDL_PACKEDLAYOUT_8888, 24, 4),
 242     SDL_PIXELFORMAT_BGR888 =
 243         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_XBGR,
 244                                SDL_PACKEDLAYOUT_8888, 24, 4),
 245     SDL_PIXELFORMAT_BGRX8888 =
 246         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_BGRX,
 247                                SDL_PACKEDLAYOUT_8888, 24, 4),
 248     SDL_PIXELFORMAT_ARGB8888 =
 249         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_ARGB,
 250                                SDL_PACKEDLAYOUT_8888, 32, 4),
 251     SDL_PIXELFORMAT_RGBA8888 =
 252         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_RGBA,
 253                                SDL_PACKEDLAYOUT_8888, 32, 4),
 254     SDL_PIXELFORMAT_ABGR8888 =
 255         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_ABGR,
 256                                SDL_PACKEDLAYOUT_8888, 32, 4),
 257     SDL_PIXELFORMAT_BGRA8888 =
 258         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_BGRA,
 259                                SDL_PACKEDLAYOUT_8888, 32, 4),
 260     SDL_PIXELFORMAT_ARGB2101010 =
 261         SDL_DEFINE_PIXELFORMAT(SDL_PIXELTYPE_PACKED32, SDL_PACKEDORDER_ARGB,
 262                                SDL_PACKEDLAYOUT_2101010, 32, 4),
 263
 264     /* Aliases for RGBA byte arrays of color data, for the current platform */
 265 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
 266     SDL_PIXELFORMAT_RGBA32 = SDL_PIXELFORMAT_RGBA8888,
 267     SDL_PIXELFORMAT_ARGB32 = SDL_PIXELFORMAT_ARGB8888,
 268     SDL_PIXELFORMAT_BGRA32 = SDL_PIXELFORMAT_BGRA8888,
 269     SDL_PIXELFORMAT_ABGR32 = SDL_PIXELFORMAT_ABGR8888,
 270 #else
 271     SDL_PIXELFORMAT_RGBA32 = SDL_PIXELFORMAT_ABGR8888,
 272     SDL_PIXELFORMAT_ARGB32 = SDL_PIXELFORMAT_BGRA8888,
 273     SDL_PIXELFORMAT_BGRA32 = SDL_PIXELFORMAT_ARGB8888,
 274     SDL_PIXELFORMAT_ABGR32 = SDL_PIXELFORMAT_RGBA8888,
 275 #endif
 276
 277     SDL_PIXELFORMAT_YV12 =      /**< Planar mode: Y + V + U  (3 planes) */
 278         SDL_DEFINE_PIXELFOURCC('Y', 'V', '1', '2'),
 279     SDL_PIXELFORMAT_IYUV =      /**< Planar mode: Y + U + V  (3 planes) */
 280         SDL_DEFINE_PIXELFOURCC('I', 'Y', 'U', 'V'),
 281     SDL_PIXELFORMAT_YUY2 =      /**< Packed mode: Y0+U0+Y1+V0 (1 plane) */
 282         SDL_DEFINE_PIXELFOURCC('Y', 'U', 'Y', '2'),
 283     SDL_PIXELFORMAT_UYVY =      /**< Packed mode: U0+Y0+V0+Y1 (1 plane) */
 284         SDL_DEFINE_PIXELFOURCC('U', 'Y', 'V', 'Y'),
 285     SDL_PIXELFORMAT_YVYU =      /**< Packed mode: Y0+V0+Y1+U0 (1 plane) */
 286         SDL_DEFINE_PIXELFOURCC('Y', 'V', 'Y', 'U'),
 287     SDL_PIXELFORMAT_NV12 =      /**< Planar mode: Y + U/V interleaved  (2 planes) */
 288         SDL_DEFINE_PIXELFOURCC('N', 'V', '1', '2'),
 289     SDL_PIXELFORMAT_NV21 =      /**< Planar mode: Y + V/U interleaved  (2 planes) */
 290         SDL_DEFINE_PIXELFOURCC('N', 'V', '2', '1')
 291 };
 292
 293 typedef struct SDL_Color
 294 {
 295     Uint8 r;
 296     Uint8 g;
 297     Uint8 b;
 298     Uint8 a;
 299 } SDL_Color;
 300 #define SDL_Colour SDL_Color
 301
 302 typedef struct SDL_Palette
 303 {
 304     int ncolors;
 305     SDL_Color *colors;
 306     Uint32 version;
 307     int refcount;
 308 } SDL_Palette;
 309
 310 /**
 311  *  \note Everything in the pixel format structure is read-only.
 312  */
 313 typedef struct SDL_PixelFormat
 314 {
 315     Uint32 format;
 316     SDL_Palette *palette;
 317     Uint8 BitsPerPixel;
 318     Uint8 BytesPerPixel;
 319     Uint8 padding[2];
 320     Uint32 Rmask;
 321     Uint32 Gmask;
 322     Uint32 Bmask;
 323     Uint32 Amask;
 324     Uint8 Rloss;
 325     Uint8 Gloss;
 326     Uint8 Bloss;
 327     Uint8 Aloss;
 328     Uint8 Rshift;
 329     Uint8 Gshift;
 330     Uint8 Bshift;
 331     Uint8 Ashift;
 332     int refcount;
 333     struct SDL_PixelFormat *next;
 334 } SDL_PixelFormat;
 335
 336 /**
 337  * \brief Get the human readable name of a pixel format
 338  */
 339 extern DECLSPEC const char* SDLCALL SDL_GetPixelFormatName(Uint32 format);
 340
 341 /**
 342  *  \brief Convert one of the enumerated pixel formats to a bpp and RGBA masks.
 343  *
 344  *  \return SDL_TRUE, or SDL_FALSE if the conversion wasn't possible.
 345  *
 346  *  \sa SDL_MasksToPixelFormatEnum()
 347  */
 348 extern DECLSPEC SDL_bool SDLCALL SDL_PixelFormatEnumToMasks(Uint32 format,
 349                                                             int *bpp,
 350                                                             Uint32 * Rmask,
 351                                                             Uint32 * Gmask,
 352                                                             Uint32 * Bmask,
 353                                                             Uint32 * Amask);
 354
 355 /**
 356  *  \brief Convert a bpp and RGBA masks to an enumerated pixel format.
 357  *
 358  *  \return The pixel format, or ::SDL_PIXELFORMAT_UNKNOWN if the conversion
 359  *          wasn't possible.
 360  *
 361  *  \sa SDL_PixelFormatEnumToMasks()
 362  */
 363 extern DECLSPEC Uint32 SDLCALL SDL_MasksToPixelFormatEnum(int bpp,
 364                                                           Uint32 Rmask,
 365                                                           Uint32 Gmask,
 366                                                           Uint32 Bmask,
 367                                                           Uint32 Amask);
 368
 369 /**
 370  *  \brief Create an SDL_PixelFormat structure from a pixel format enum.
 371  */
 372 extern DECLSPEC SDL_PixelFormat * SDLCALL SDL_AllocFormat(Uint32 pixel_format);
 373
 374 /**
 375  *  \brief Free an SDL_PixelFormat structure.
 376  */
 377 extern DECLSPEC void SDLCALL SDL_FreeFormat(SDL_PixelFormat *format);
 378
 379 /**
 380  *  \brief Create a palette structure with the specified number of color
 381  *         entries.
 382  *
 383  *  \return A new palette, or NULL if there wasn't enough memory.
 384  *
 385  *  \note The palette entries are initialized to white.
 386  *
 387  *  \sa SDL_FreePalette()
 388  */
 389 extern DECLSPEC SDL_Palette *SDLCALL SDL_AllocPalette(int ncolors);
 390
 391 /**
 392  *  \brief Set the palette for a pixel format structure.
 393  */
 394 extern DECLSPEC int SDLCALL SDL_SetPixelFormatPalette(SDL_PixelFormat * format,
 395                                                       SDL_Palette *palette);
 396
 397 /**
 398  *  \brief Set a range of colors in a palette.
 399  *
 400  *  \param palette    The palette to modify.
 401  *  \param colors     An array of colors to copy into the palette.
 402  *  \param firstcolor The index of the first palette entry to modify.
 403  *  \param ncolors    The number of entries to modify.
 404  *
 405  *  \return 0 on success, or -1 if not all of the colors could be set.
 406  */
 407 extern DECLSPEC int SDLCALL SDL_SetPaletteColors(SDL_Palette * palette,
 408                                                  const SDL_Color * colors,
 409                                                  int firstcolor, int ncolors);
 410
 411 /**
 412  *  \brief Free a palette created with SDL_AllocPalette().
 413  *
 414  *  \sa SDL_AllocPalette()
 415  */
 416 extern DECLSPEC void SDLCALL SDL_FreePalette(SDL_Palette * palette);
 417
 418 /**
 419  *  \brief Maps an RGB triple to an opaque pixel value for a given pixel format.
 420  *
 421  *  \sa SDL_MapRGBA
 422  */
 423 extern DECLSPEC Uint32 SDLCALL SDL_MapRGB(const SDL_PixelFormat * format,
 424                                           Uint8 r, Uint8 g, Uint8 b);
 425
 426 /**
 427  *  \brief Maps an RGBA quadruple to a pixel value for a given pixel format.
 428  *
 429  *  \sa SDL_MapRGB
 430  */
 431 extern DECLSPEC Uint32 SDLCALL SDL_MapRGBA(const SDL_PixelFormat * format,
 432                                            Uint8 r, Uint8 g, Uint8 b,
 433                                            Uint8 a);
 434
 435 /**
 436  *  \brief Get the RGB components from a pixel of the specified format.
 437  *
 438  *  \sa SDL_GetRGBA
 439  */
 440 extern DECLSPEC void SDLCALL SDL_GetRGB(Uint32 pixel,
 441                                         const SDL_PixelFormat * format,
 442                                         Uint8 * r, Uint8 * g, Uint8 * b);
 443
 444 /**
 445  *  \brief Get the RGBA components from a pixel of the specified format.
 446  *
 447  *  \sa SDL_GetRGB
 448  */
 449 extern DECLSPEC void SDLCALL SDL_GetRGBA(Uint32 pixel,
 450                                          const SDL_PixelFormat * format,
 451                                          Uint8 * r, Uint8 * g, Uint8 * b,
 452                                          Uint8 * a);
 453
 454 /**
 455  *  \brief Calculate a 256 entry gamma ramp for a gamma value.
 456  */
 457 extern DECLSPEC void SDLCALL SDL_CalculateGammaRamp(float gamma, Uint16 * ramp);
 458
 459
 460 /* Ends C function definitions when using C++ */
 461 #ifdef __cplusplus
 462 }
 463 #endif
 464 #include "close_code.h"
 465
 466 #endif /* _SDL_pixels_h */
 467
 468 /* vi: set ts=4 sw=4 expandtab: */